Apparatus for liquid and pulverized fuel furnaces



J. MCDONALD Feb. 17, 1931.`

APPARATUS FOR LIQUID AND ULVERIZED FUEL FURNACES Filed June 17, 1929 2 Sheets-Sheet l Isl noawtoz Feb- 17, l931- J. MCDQNALD 1,793,111

\ APPARATUS FOR LIQUID AND PULVERIZED FUEL FURNACES Filed June 17. 1929 2 Sheets-Sheet 2 wuentoz bust'ion.

Patented Feb. 17, '1931 f UNITED STATES JAMES MCDONALD, or wEEniAWxEN, NEW YORK, AssTGNoR To Tom) DRY Doon, EN- GINEERING a REPAIR coRroRA'rIoN, or BROOKLYN, NEW YORK ArPARArs `ron. LIQUID ANn Application led Iunc 17,

This invention relates to apparatus for use with furnaces employin liquid or pulveri/zed fuel as the' combusti le medium and wherein means are providedl for admitting regulated My present improvements are directed to means, equally applicable with liquid or pulverized fuel vburning apparatus adapted for either natural draft or forced draft, said means being intended to cause a suicient volume of air to be introduced into the flame nearer the point of fuel issuance from the burner nozzle than has heretofore been attainable in liquid fuel burningfurnaces, with the obj ect of securing more complete combustion of thefuel. Also my improvements have the eect of preventing the air that flows through the flame coneslots from spreading` away from the flame, and tending to restrict its radial dispersion, thereby causing this' air supply to be directed into the main combustion zone. f l l Other features and advantages of my in-J vention will hereinafter appeare v lin the drawings: r v

Figure 1 is a central sectional view of a burner apparatus,'of the Todd natural draft type, including my improvements.

Fig. 2 is a reairview'of my improved dame cone, on an enlarged scale.

. hig. 3 is a front view of said dame cone, an

F ig. el isa section on the line 4 of Fig. 3.

While for the vpurpose of describing my improvements Vl have in this 'application shown them as applied to a Todd type fur nace front adapted tolsupply air under natural draft to a furnace, it is tobe understood that my improvements are .equally applicable to other a paratus, either for natural or forced dra and are therefore not limited by or to the apparatus shown herein.

ln Fig.. 1 there appears a furnace front havingfthe casingl which is provided with means of connection to the furnace late 2, and has an opening in the form of a enturi ring 3, directed toward the Ifurnace interior, and the brick venturi v4. ncludedwithin the furnace front is' the-.j soket-'tube 5, the burner quantities of air to support com- PULvERIzED FUEL rURNAcEs 1929. serial No.' 371,400.

tube 6' therein, and the atomizing nozzle 7. The air cone 8 co-acts with the rVenturi ring 3 to regulate the amount of air supplied to the furnace.. f V

' The parts thus described and others shown in Figl correspond with the disclosure in U. S. atent No:1,412,023 and' need' np further Velaboration herein. l

The present improvements relate to the structure of the flame cone, here generally designated by the numeral 9, which is mount ed on the jacket tube 5, near the linner end thereof, land is'prdvided with rods 10 whereby it may be adjusted longitudinally. vSaid lame cone is here shown as provided with an encircling ring or annulus 11, having the forward portion 1 2 and rearward portion 13.

lAlso the fla-me cone 9 is perforated with a series of tangential slots 14 that extend therethrough, from front to rear, for the purpose of giving a whirling motion to air introduced thereby into the furnace.

It is the novel characteristic features `of this llame cone which constitute my present improvements.

The forward Hange portion 12 of the flame cone serves to conne the quota of air owing.

over the cone tiv'vard the furnace entrance, thereby restraining its tendency to enter the furnace, away from the dame, in an enlarging conoidal formation, but instead causing this quota of air to pass' through the slots 14 to thus mingle with the liquid fuel issuing from the nozzle at the genesis of vdame propagation, in. this manner assuring more coniplete combustion than is otherwise possible By ,reason of the tangential arrangement of slots 14 air passing therethrough-is given a whirling motion that causes it to'hlend or mix with the fuel, but since this whirling niotion tends to spread the air How away from the proper connues of the dame zone ll have fining `them in the rearwardly directed cyl l lindrical ath of the dame.

Since t e slots 1t are formed obliquely through the .material of Home cone 9, as fshown in Fig. 4, the streams of air derving therethrough in whirling formation pass contactingly against the rearward surface of said flame cone and exert a cooling influence thereon, thereby prolonging its life.

lt is to he understood that While the specific description of the herein given apparatus or furnace front is directed to a type of apparatus having a burner particularly adapted for the employment of liquid fuel, the flame cone constituting my present improvement is equally useful in conjunction with apparatus having a lourner adapted for employment with pulverized coal.

Variations Within the spirit and scope of my invention are equally comprehended by the foregoing disclosure.

l claim l. The combination With a furnace having a fuel burner,.air supply means and a ame cone surrounding said burner, said cone provided with tangential slots for the passage of air, of a cylindrical annulus surrounding said cone to present a forward flange adapted to direct air iiovv toward said slots and a rearward ange to restrict the radial dispersion of the air streams at the rear of the cone.

2. The combination with a furnace having a uel burner, air supply means and a slottedflarne cone surrounding said burnergv of a forwardly directed cylindrical flange surrounding said lame cone and extending from the area adj acent one extremity of the slots in said cone to coniningly direct air ow t0- Ward'said slots.

3. The combination with a furnace having a fuel burner, air supply means and a flame cone surrounding said burner, said cone provided With tangential slots for the passage of air, of a rearwardly directed cylindrical Harige surrounding said cone, to restrict the radial dispersion of the air streams at the rear of the cone.

Executed this 12th day of June, 1929.

JAR/ES ,MGDONALD 

